Atlas Copco G 160 VSD Original Instruction Book page 21

Instruction book
Main functions
In general, the regulator has the following functions:
• Controlling the motor speed (Variable Speed Drive), reducing the power consumption and
pressure band.
• Controlling the speed of the fans of the coolers, reducing the power consumption and noise
level.
• Protecting the compressor.
• Monitoring components - service warning.
• Automatic restart after voltage failure.
Controlling the compressor speed - reducing power consumption and pressure band
VSD compressors optimize the power consumption and reduce the operating pressure band by
matching the motor speed to the air net pressure.
The regulator will continuously vary the motor speed maintaining the net pressure as close as
possible to the programmed pressure set-point. The pressure fluctuations will be very low.
Indirect stopping
Ref.
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
APF221384
Example of a pressure/time diagram
Designation
Pressure
Direct stop offset
Set-point
Motor speed
Minimum
Time
Load
Indirect stop
Start
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